Interplay between various active regions and the interband transition for AlGaN-based deep-ultraviolet light-emitting diodes to enable a reduced TM-polarized emission

被引：10

作者：

Tian, Kangkai ^{[1
,2
]}

Chu, Chunshuang ^{[1
,2
]}

Che, Jiamang ^{[1
,2
]}

Shao, Hua ^{[1
,2
]}

Kou, Jianquan ^{[1
,2
]}

Zhang, Yonghui ^{[1
,2
]}

Zhou, Xingye ^{[3
]}

Feng, Zhihong ^{[3
]}

Wei, Tongbo ^{[4
]}

Zhang, Zi-Hui ^{[1
,2
]}

机构：

[1] Hebei Univ Technol, Sch Elect & Informat Engn, Inst Micronano Photoelectron & Electromagnet Tech, 5340 Xiping Rd, Tianjin 300401, Peoples R China

[2] Key Lab Elect Mat & Devices Tianjin, 5340 Xiping Rd, Tianjin 300401, Peoples R China

[3] Hebei Semicond Res Inst, Natl Key Lab ASIC, Shijiazhuang 050051, Hebei, Peoples R China

[4] Chinese Acad Sci, Inst Semicond, State Key Lab Solid State Lighting, Beijing 100083, Peoples R China

来源：

JOURNAL OF APPLIED PHYSICS | 2019年 / 126卷 / 24期

基金：

北京市自然科学基金;

关键词：

BAND PARAMETERS; QUANTUM-WELL; EFFICIENCY;

D O I：

10.1063/1.5127916

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Al-rich AlGaN-based deep-ultraviolet light-emitting diodes (DUV LEDs) have a low light extraction efficiency, especially when the emission wavelength is shorter than 280 nm, and this is partially because of the dominant transverse-magnetic polarized light. Our results show that the transverse-electric (TE) polarized light can be obtained even if the emission wavelength becomes even shorter by reducing the quantum well thickness. The ultrathin quantum well enables the enhanced TE-polarized emission that arises from the redistributed subbands for holes. On the contrary to the common belief, we observe a blueshift for the emission wavelength when the AlN composition in the quantum barrier increases. The internal quantum efficiency (IQE) for DUV LEDs with ultrathin quantum wells is no longer determined by the quantum-confined Stark effect, while quantum barrier with high AlN composition is vitally important to improve the electron injection efficiency and thus enhance the IQE.

引用

页数：7

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